Received: 7 August 2019
Accepted: 1 May 2020
First Online: 14 May 2020
Ethics approval and consent to participate
: The present study was approved by the Ethics Committee of Shahid Beheshti University of Medical Sciences (IR.SBMU.PHNM.1395.446). Written informed consent was obtained from the participants before inclusion into the study.
: Not applicable.
: The authors declare that they have no competing interests.